Why Bottled Water Carries More Plastic Particles Than You'd Expect
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If you drink bottled water, the bottle and the bottling process are the main sources, according to the review, of the plastic particles in it. That's a central finding of a new review of the research.
In a review published October 1, 2026 in Environmental Science and Pollution Research, Rajat Maurya and colleagues at Dr. Ram Manohar Lohia Institute of Medical Sciences in Lucknow, India, pulled together the evidence on micro- and nanoplastics in bottled water: where they come from, how they're measured, what's known about health and what regulators are doing.
Where the particles come from
According to the review, microplastics in bottled water come mainly from the breakdown of polyethylene terephthalate (PET), the plastic most bottles are made of, and from the bottling process itself. Source water and storage conditions add more.
Handling matters too. As summarized by Scienmag, the review points to studies in which squeezing bottles, exposing them to sunlight and freezing them all sped up particle shedding.
How much, and how sure
Reported levels vary widely between brands and regions, from a few to thousands of particles per litre. Part of that spread is about method: detection techniques differ a lot in sensitivity, and there are no standardized protocols or enough certified reference materials to compare studies cleanly. The review rates µRaman and µFT-IR spectroscopy as the most reliable techniques. Per Scienmag's summary, studies that looked for smaller particles consistently found more of them.
The review's bottom line on exposure: people who drink bottled water may be ingesting substantially more microplastics than people who drink tap water.
What we don't know
Health effects are still uncertain. The review notes concerns that the smallest particles, nanoplastics under 100 nanometres, can cross biological barriers, but it also says the lack of human health data and standard methods makes accurate risk assessment a significant challenge. It doesn't establish that bottled water harms health.
Our general tips
These are WaterVO's general tips based on the handling factors described above, not recommendations from the review's authors, and they reduce rather than eliminate exposure: keep bottled water out of hot sun, don't freeze it, and avoid squeezing bottles more than you need to. Related: PET nanoplastic reference standards →
Editorial note: WaterVO News summarizes peer-reviewed research and press coverage of it. No health claims beyond the source. No brand is named or tested here. Photo: Fourteenzerozero, CC0, via Wikimedia Commons.